Clayton Quarry (Miocene of the United States)

Where: Brown County, Nebraska (42.7° N, 100.0° W: paleocoordinates 43.1° N, 97.4° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Merritt Dam Member (Ash Hollow Formation), Clarendonian (13.6 - 10.3 Ma)

Environment/lithology: terrestrial

Primary reference: M. F. Skinner and F. W. Johnson. 1984. Tertiary stratigraphy and the Frick Collection of fossil vertebrates from north-central Nebraska. Bulletin of the American Museum of Natural History 178(3):1-368 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 18095: authorized by John Alroy, entered by John Alroy on 05.08.1992, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• probably the same as the FMNH "Quinn Canyon" site; the quarry is in Quinn Canyon and no other FMNH collection from this area is mentioned by Skinner and Johnson; this locality is said by Korth 1997a to be in the Cap Rock Member based on the authority of Skinner and Johnson, which may relate to the fact that these authors place Clayton Quarry very low in the Merritt Dam Member
FMNH specimens seen by JA on 30.5.91
equids: Hulbert 1989 pers. commun.
270 F:AM specimens (Skinner and Johnson 1984), but list is mostly based on FMNH
 Rodentia - Heteromyidae
"Mioheteromys agrarius n. sp." = Diprionomys agrarius4
"Mioheteromys agrarius n. sp." = Diprionomys agrarius4 Wood 1935 rodent
of Wood 1935 from FMNH "Quinn Canyon" locality DUPLICATE REF 2132 or 2133
 Rodentia - Castoridae
Eucastor sp. Allen 1877 beaver
 Rodentia - Mylagaulidae
Mylagaulidae indet.1 Cope 1881 rodent
 Lagomorpha - Leporidae
Hypolagus fontinalis Dawson 1958 rabbit
FMNH: mentioned by Dawson 1958
 Perissodactyla - Rhinocerotidae
Teleoceras sp. Hatcher 1894 rhinoceros
JA pers. obs.: FMNH
 Perissodactyla - Equidae
Hippotherium sp. Kaup 1832 hipparionine horse
JA pers. obs.: FMNH
Pseudhipparion gratum2 Leidy 1869 hipparionine horse
pers. commun.: also seen by JA at FMNH
Nannippus sp.2 Matthew 1926 hipparionine horse
pers. commun.: "A"
Neohipparion affine2 Leidy 1869 hipparionine horse
pers. commun.
Protohippus supremus2 Leidy 1869 horse
pers. commun.
Calippus martini2 Hesse 1936 horse
pers. commun.
Calippus placidus2 Leidy 1869 horse
pers. commun.
 Carnivora - Barbourofelidae
Barbourofelis whitfordi Barbour and Cook 1915 carnivoran
 Carnivora - Amphicyonidae
Pseudocyon sp.3 Lartet 1851 bear-dog
 Carnivora - Mustelidae
Leptarctus wortmani5 Matthew 1924 mustelid carnivore
F:AM 25169
 Carnivora - Canidae
Leptocyon matthewi7 Tedford et al. 2009 canine
Cynarctus crucidens8 Barbour and Cook 1914 bone-crushing dog
Aelurodon taxoides8 Hatcher 1894 bone-crushing dog
Epicyon saevus8 Leidy 1858 bone-crushing dog
Paratomarctus euthos8 McGrew 1935 bone-crushing dog
multiple specimens from "Clayton or East Clayton quarries" (so possibly not present here)
 Ungulata - Merycoidodontidae
"Merychyus novomexicanus" = Ustatochoerus medius novomexicanus6
"Merychyus novomexicanus" = Ustatochoerus medius novomexicanus6 Frick 1929 oreodont
 Ungulata - Tayassuidae
Macrogenis cf. crassigenis10 Matthew and Gidley 1904 peccary
probably = "Prosthennops sp." at FMNH
 Ungulata - Camelidae
Aepycamelus sp. Macdonald 1956 camel
JA pers. obs.: FMNH
 Ungulata - Gelocidae
Pseudoceras skinneri9 Frick 1937 ruminant